A Bidder for a Contract other than for public construction may request withdrawal of his. Fill in forms are now available.If none of the construction types matches your project, fill in the circle next to OTHER, and indicate the type of construction in the blocks. Prequalification. If checked, the 2 low bidders must file within 24 hours after the letting an "Affidavit of Availability" (Form BC 57), in. You must promptly notify the owner in writing of your mistake and request for withdrawal.